具有纳米多孔双网络的透明、阻燃和可加工纤维素/二氧化硅复合气凝胶,用于节能建筑

IF 4.9 2区 工程技术 Q1 MATERIALS SCIENCE, PAPER & WOOD
Jing Sun, Jing Hu, Ya Zhong, Junjun Zhang, Shuxuan Pan, Zichen Xiang, Sheng Cui, Xiaodong Shen
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引用次数: 0

摘要

高透光率的围护结构在建筑能耗中所占比例越来越大,是节能减排的短板之一。纤维素基气凝胶因其导热系数低、机械性能好而成为人们关注的研究课题。然而,大多数纤维素基气凝胶不透明且易燃,限制了其应用。本文采用离子液体1-烯丙基3-甲基咪唑氯盐溶解棉浆,然后在纤维素凝胶中加入四乙基正硅酸盐(TEOS)和甲基三乙氧基硅烷(MTES)共前驱体,通过两步溶胶-凝胶法、旋涂技术和超临界二氧化碳干燥,制备了具有 "有机-无机 "结构的纤维素/二氧化硅复合气凝胶(CAS)。研究了所制备气凝胶样品的合成机理、微观结构、机械性能和热性能。所制备的 CAS 具有低密度(0.093-0.170 g/cm3)、高比表面积(660.87-1089.70 m2/g)和高力学性能(抗压强度为 18.74 MPa,抗拉强度高达 1.54 MPa,弯曲试验超过 500 次)。尤其是 CAS4 具有最低的热导率(0.0188 W-m-1-K-1)、良好的热稳定性(331 °C)、高透明度(91.7%)和优异的阻燃性。结果表明,在热平衡状态下,气凝胶玻璃模型内外温差高达 12 ℃。因此,所制备的高性能纤维素/二氧化硅复合气凝胶可提高气凝胶玻璃在建筑围护结构中的作用,在透明节能建筑和保温隔热方面具有广阔的应用前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Transparent, flame retardant and machinable cellulose/silica composite aerogels with nanoporous dual network for energy-efficient buildings

Transparent, flame retardant and machinable cellulose/silica composite aerogels with nanoporous dual network for energy-efficient buildings

The envelope structure with high light transmittance accounts for an increasing proportion of building energy consumption, which is one of the shortcomings of energy conservation and emission reduction. Cellulose-based aerogel has become a research topic of interest because of its low thermal conductivity and good mechanical properties. However, most cellulose-based aerogels are opaque and flammable limiting their applications. Herein, cellulose/silica composite aerogels (CAS) with "organic–inorganic" structures were fabricated by two-step sol–gel method, spin-coating technique and supercritical CO2 drying, using the ionic liquid 1-allyl 3-methylimidazolium chloride salt to dissolve the Cotton pulp, followed by the addition of tetraethylorthosilicate (TEOS) and methyltriethoxysilane (MTES) co-precursors into the cellulose gels. The synthesis mechanism, microstructure, mechanical and thermal properties of as-prepared aerogels samples were investigated. The obtained CAS have low density (0.093–0.170 g/cm3), high specific surface area (660.87–1089.70 m2/g), and high mechanical property (compressive strength of 18.74 MPa, tensile strength as high as 1.54 MPa, and bending tests above 500 times). In particular, the CAS4 shows the lowest thermal conductivity (0.0188 W·m−1·K−1), good thermal stability (> 331 °C), high transparency (91.7%) and excellent flame retardancy. In addition, the self-designed aerogels glasses model was placed in a real outdoor environment for 5 h. The results showed that the temperature difference between the inside and outside of the aerogels glasses model was as high as 12 ℃ under the thermal equilibrium state. Thus, the as-prepared high-performance cellulose/silica composite aerogels may increase the role of aerogels glasses in the building envelope and have promising applications in transparent energy-efficient construction and thermal insulation.

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来源期刊
Cellulose
Cellulose 工程技术-材料科学:纺织
CiteScore
10.10
自引率
10.50%
发文量
580
审稿时长
3-8 weeks
期刊介绍: Cellulose is an international journal devoted to the dissemination of research and scientific and technological progress in the field of cellulose and related naturally occurring polymers. The journal is concerned with the pure and applied science of cellulose and related materials, and also with the development of relevant new technologies. This includes the chemistry, biochemistry, physics and materials science of cellulose and its sources, including wood and other biomass resources, and their derivatives. Coverage extends to the conversion of these polymers and resources into manufactured goods, such as pulp, paper, textiles, and manufactured as well natural fibers, and to the chemistry of materials used in their processing. Cellulose publishes review articles, research papers, and technical notes.
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